linux-kernel - [PATCH v3 7/7] scsi: target: Add atomic support to target_core

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251020103820.2917593-8-john.g.garry@oracle.com>
Date: Mon, 20 Oct 2025 10:38:20 +0000
From: John Garry <john.g.garry@...cle.com>
To: martin.petersen@...cle.com
Cc: target-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org, michael.christie@...cle.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH v3 7/7] scsi: target: Add atomic support to target_core_iblock

From: Mike Christie <michael.christie@...cle.com>

This has target_core_iblock use the LIO helper function to translate its
block_device atomic settings to LIO settings. If we then get a write
that LIO has indicated is atomic via the SCF_ATOMIC flag, we use the
REQ_ATOMIC flag to tell the block layer to perform an atomic write.

Signed-off-by: Mike Christie <michael.christie@...cle.com>
Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 drivers/target/target_core_iblock.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 281612b9830f8..8ec7b534ad760 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -152,6 +152,8 @@ static int iblock_configure_device(struct se_device *dev)
 	if (bdev_nonrot(bd))
 		dev->dev_attrib.is_nonrot = 1;
 
+	target_configure_write_atomic_from_bdev(&dev->dev_attrib, bd);
+
 	bi = bdev_get_integrity(bd);
 	if (!bi)
 		return 0;
@@ -773,6 +775,9 @@ iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
 			else if (!bdev_write_cache(ib_dev->ibd_bd))
 				opf |= REQ_FUA;
 		}
+
+		if (cmd->se_cmd_flags & SCF_ATOMIC)
+			opf |= REQ_ATOMIC;
 	} else {
 		opf = REQ_OP_READ;
 		miter_dir = SG_MITER_FROM_SG;
-- 
2.43.5